Not a big reality programme fan. it's ridiculous what people will do to get on tv.
Maddening, sometimes, ain't it?
But, IMO, the best reality series of all time would have to be The Mole. Fantastic franchise idea -- put a bunch of people together and assign one the task of ensuring the others fail without being caught.
Seasons 1 and 2 of the US version with Anderson Cooper were my favorite. Anderson is the perfect host, omg. There was just something really genuine about the whole thing that hasn't really been demonstrated since.
But a lot of other countries have their own versions, too. The series actually started in Belgium, and the UK and Australia have picked it up, too, along with many non-English nations.
If you can find it, it's quality stuff!